How Did Traffic Signs Colors And Shapes Become Standardized?

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How did traffic signs colors and shapes become standardized?

Without googling it. Red likely because in itself it means stop or danger or something to grab you attention. Like, when you get an “F” in school or a check mark, it is usually in red. Green because it usually indicates the GO ahead, as in language, you’ve got the green light to go ahead. Yellow, who knows, problems because it is in the middle interns of what it implies, not danger, of moving forward but calm but with caution. Just like when you wear clothes, yellow is sort of in the middle of the road so to speak.

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Yellow. This one is probably my favorite as it is for safety, to slow down and to make sure you don't hit a pedestrian or other person on the street.

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